When collecting a distribution-system sample for bacteriological testing, the person collecting the sample should allow the water to run _______ before
... [Show More] filling the sample bottle. - correct answer as long as necessary to clear service line
A chemical commonly used to raise PH is. - correct answer Lime.
Black stains on plumbing fixtures might be attributable to. - correct answer Manganese.
One kilogram equals _____ grams. - correct answer 1000
The indicator organisms used to determine contamination of drinking water are. - correct answer Coliform group.
The packing around the shaft of a centrifugal pump should be. - correct answer Tightened just enough to allow an occasional drop of liquid to escape.
The chemical symbol for iron is. - correct answer Fe.
One pound per square inch of pressure will raise water ______ ft. - correct answer 2.31
Static head is defined as the. - correct answer Pressure due to the depth or elevation of the water.
What is used to detect chlorine leaks. - correct answer 10 percent solution of ammonia hydroxide.
The pressure gauge reading at the base of a tank filled to a depth of 1ft is ______ psi. - correct answer 0.433
The multiple-tube fermentation test consists of three distinct tests. These tests, in order performed, are the. - correct answer Presumptive, confirmed, and completed tests.
Chlorine gas is. - correct answer 2 1/2 times denser than air.
Polyphosphates may be used in water treatment to retard corrosion and. - correct answer Calcium scale.
Calcium hypochlorite is formulated as a. - correct answer Powder.
Chlorine leaks in metal containers tend to. - correct answer Become larger.
Determining the PH of water is one of the important tests of water quality. The results of the PH test indicate the. - correct answer Hydrogen ion activity.
Leakage from a packing gland should be approximately. - correct answer One drop per second.
A chlorine cylinder valve is thought to be leaking. If ammonia vapor is passed near the valve. The presence of a leak would be indicated by. - correct answer White smoke.
If a fire hydrant requires a nozzle pressure of 100 psi, what head of water must be used to supply it? - correct answer 231 ft
A water main should be disinfected. - correct answer After the pipe is laid in place.
Carbon dioxide in water will. - correct answer Lower pH.
A pneumatic ejector lifts water from low points to higher levels. The device used to achieve this is a(n). - correct answer Air compressor.
Pressure is commonly measured in. - correct answer Pounds per square inch. [Show Less]